Bug 825447 - Populate safepoints directly in backtracking register allocator, r=jandem.
Bug 826439 - use floats instead of doubles for exponential histogram statistic calculations; r=vdjeric
Bug 559432 - Don't fail the assert if the cached actor is null... that probably just means we're in the process of tearing down the instance, r=josh

--HG--
extra : rebase_source : c7add3dc063f52127818fcdfc9b76e45ed45bf1a